Water flows at 50 °C inside a 1.5 cm ID (inner diameter) tube such that hi 3500 W/m?°C.

The tube has a wall thickness of 0.8 mm with a thermal conductivity of 16 W/m C. The outside of the tube loses heat by free convection to the surrounding air with ho 7.6 W/m?.°C. Consider that the length of the tube is 1 m and neglects the effects of radiation.

Note: Show work for partial or full credit.

a. Calculate the value of each of the thermal resistances.

b. Calculate the heat losses to the surrounding air at 20 °C.

c. the mass flow rate of the water is 0.02 kg/s and the specific heat capacity is 4200

J/kg°C, by how much does the average temperature of the water increase?

Answer rating: 100% (QA)

To solve this problem we can use the concept of thermal resistances and the equation for heat transfer Q T1 T2 R1 R2 R3 where Q is the heat transfer r... View the full answer